LASER-BASED MULTIPARAMETER MEASUREMENTS IN A JET ENGINE BURNER

Novel ultraviolet laser-based multidimensional measurement techniques were applied to the burner exit of a H-2-air jet engine. Two-dimension al Rayleigh scattering and one-dimensional Raman scattering were used to measure the mean temperature field, the distributions of the majori ty species H-2, O-2, H2O, and N-2, and the turbulence intensity distri bution sigma(T)/T in the burner exit plane. The wealth of data allows are elucidation of the turbulent mixing and combustion processes insid e the burner. For example, the majority species distributions show tha t unburned H-2 occurred in certain regions in the burner exit plane th at were essentially free of O-2 and vice versa, This pattern was const ant in time, This means that certain flow structures in the burner cau sed rich mixing in some areas and lean mixing in others, and it explai ns why overall combustion was not complete in this particular burner.